CVE-2021-46700

MEDIUMNVD 6.56.5—

6.5

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 36.9%
KEV: Not listed

Published

February 19, 2022

Last Modified

April 24, 2026

References (2)

cve@mitrehttps://github.com/saitoha/libsixel/issues/158
af854a3a-2127-422b-91ae-364da2661108https://github.com/saitoha/libsixel/issues/158

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-415Double Free

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2021-46700?

CVE-2021-46700 is a medium vulnerability published on February 19, 2022. In libsixel 1.8.6, sixelencoderoutputwithoutmacro (called from sixelencoderencode_frame in encoder.c) has a double free.

When was CVE-2021-46700 disclosed?

CVE-2021-46700 was first published in the National Vulnerability Database on February 19, 2022, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-46700 actively exploited?

CVE-2021-46700 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-46700?

CVE-2021-46700 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2021-46700?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-46700, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-46700

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-46700?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)